19-07-2015, 08:05 AM
(This post was last modified: 19-07-2015, 08:10 AM by JTaylor2005.)
Yeah looking at the wiring diagram in the Haynes manual for the 306 shows that there is only one on the HDI.
It has 3 wires. Two go back to the ecu (one for power and one for the temp signal) and then one goes up to the clocks on the dashboard for the gauge up there.
Looking at the diagram it shows that there are two variable resistors inside the temperature sensor.
One is in line with the two cables that come from the ecu. This is a closed circuit so even if you had a bad earth it would still function correctly.
The other variable resistor which is for the dash gauge just goes straight down to earth. My guess would be that the lower the resistance is the higher the gauge would read. If you have a bit of corrosion on the plug, pins, or connection to the block the earth wouldn't be very good meaning it would see more resistance than it should and give a lower and unreliable reading to the gauge.
That would explain why you could see different readings om the dash compared to the software.
It has 3 wires. Two go back to the ecu (one for power and one for the temp signal) and then one goes up to the clocks on the dashboard for the gauge up there.
Looking at the diagram it shows that there are two variable resistors inside the temperature sensor.
One is in line with the two cables that come from the ecu. This is a closed circuit so even if you had a bad earth it would still function correctly.
The other variable resistor which is for the dash gauge just goes straight down to earth. My guess would be that the lower the resistance is the higher the gauge would read. If you have a bit of corrosion on the plug, pins, or connection to the block the earth wouldn't be very good meaning it would see more resistance than it should and give a lower and unreliable reading to the gauge.
That would explain why you could see different readings om the dash compared to the software.
